I'd only be able to say what I'd like to have, and only from internet demos and reviews. Yes, lame, I know.

1. BK9 - because I like the styles, the drums and the 76 keybed
2. Pa900 - because they have a ton of feature and Helicon VH
3. S950 - only if the first two options would be totally unavailable and I had the cash itching in my pocket.